EP2098635A2 - Apparatus for manufacturing and/or treating a sheet of material - Google Patents

Abstract

The device (10) has a constant part (30) or a fiber feeder is attached to a multi-layer headbox (12) for feeding of nozzle partial areas (24', 24'') adjacent to a lamella (26) over turbulence producing sections (20', 20''). The lamella exhibits rigidity (S) in cross section of 10 nanometers, where the rigidity is defined in preset equation. A mechanical unit (32) is provided for variable adjustment of different speeds of partial beams (14, 16) by machine width changes of geometry of one of the nozzle partial areas. The lamella is partially made of carbon fiber-reinforced plastic and metal.

Description

The invention relates to a device for producing and / or treating a fibrous web, in particular paper or board web, with a fed with pulp suspension multi-layer casserole to produce a composite of several sub-beams pulp suspension jet, a turbulence generator and arranged in the flow direction of the pulp suspension behind nozzle with a nozzle chamber comprises, which is divided by at least one lamella in a plurality of nozzle subspaces, wherein adjacent to a respective blade two nozzle subspaces are guided by the separate pulp suspension partial streams and at the end remote from the respective turbulence generator section end is provided in each case a machine-wide gap through which generates a respective partial beam becomes.

A multi-layer casserole with a turbulence generator and a downstream nozzle arranged in the flow direction, the nozzle space is divided by at least one lamella in a plurality of nozzle subspaces, for example, from EP 0 681 057 A2 known. In this case, this headbox for the different nozzle subspaces separate constant parts are assigned. The respective slats are each formed as a flexurally soft plate and pivotally mounted at its upstream end about an axis extending in the machine transverse direction axis. The fins can each be adjusted freely between the two adjacent material flows. As a result, possibly occurring pressure differences between the adjacent material streams are balanced, so that the velocities of the two material streams at least substantially equalize with each other.

In particular, multi-layer casseroles with separate constant parts and solid dividing walls are also known. With this known technology, different jet speeds can be implemented in the individual layers. The objective here is an influence on the breaking length ratio in the z-direction, that is to say in the thickness direction of the fibrous web, for example for influencing the ability to copy.

The invention has for its object to provide an improved device of the type mentioned above, with the different speeds of the partial beams in a simple and reliable manner, especially in a multi-layer casserole with one or more movable or flexible blades are possible.

According to the invention, this object is achieved in that the multi-layer headbox for supplying the respective turbulence generator sections feeding the two adjacent to a respective lamella nozzle part spaces is assigned for this common constant part or pulp feed that the lamella has a stiffness, which is on average at least 10 Nm, wherein the stiffness is defined as S = Eh ^3/12 (1-v ²⁾ where S is the stiffness of the slat, e is the modulus of elasticity of the lamella, h is the thickness of the lamella and v is the Poisson ratio for the material of the lamella , And that the blade is flexibly executed or movably mounted and rigid, and that means for variable adjustment of different speeds of the two respective partial beams are provided on a corresponding machine-wide change in geometry at least one of the two nozzle subspaces. The transverse strain number is the reciprocal of the Poisson number.

Due to this design, the function of different partial jet velocities can now be fulfilled even in the case of a multi-layer headbox with one or more articulated or rigidly mounted lamellae, wherein, moreover, these different partial jet speeds can be variably adjusted. With a hinged Stability mounted on average, the stiffness is at least 10 Nm, preferably 60 Nm. On the other hand, in the case of a rigidly mounted lamella, that is to say a lamella without a joint, the rigidity on average also amounts to at least 10 Nm. If this rigidly mounted lamella consists of a homogeneous material and if it has a constant thickness, then its rigidity is at least in the region of the nozzle 10 to 1000 Nm. However, if this rigidly mounted lamella consists of a non-homogeneous material and / or has a non-constant thickness, then its rigidity is at least in the region of the nozzle 10 to 500 Nm. Overall, the described rigidity of the blade can extend in the machine direction and / or in the cross-machine direction.

In this case, the interaction of the two respective turbulence generator sections and a hydraulic nozzle system arranged behind them results in a corresponding change in the exit velocity of the two relevant partial beams via a respective change in geometry of at least one nozzle compartment. Because of this solution, an online control of the z-orientation in the fibrous web, ie a control of the orientation in the thickness direction of the fibrous web, is now also possible in particular.

Preferably, the multi-layer headbox for the feed of the two nozzle subspaces adjoining a respective lamella via the respective turbulence generator sections is assigned a common inlet pipe, in particular a common transverse pipe.

The lamella can in particular be articulated or rigidly mounted in the region of its end facing the turbulence generator. In the case of an articulated mounting, the relevant pivot axis expediently extends in the cross-machine direction.

It is also particularly advantageous if the lamella extends at least into the gap region of the two adjacent nozzle subspaces and preferably at least extends to the nip-side ends of the nozzle walls defining the adjacent nozzle subspaces on the opposite side of the sipe.

According to an expedient practical embodiment of the device according to the invention, the means for setting different partial jet velocities comprise means for variably adjusting the geometry of at least one of the two nozzle subspaces via which the geometry of a respective nozzle subspace is variable so that the static pressure acting on the vane on the relevant side is changeable.

In this case, the means for setting different partial jet velocities are preferably designed such that the difference or the ratio of the static pressures acting on the two opposite sides of the lamella can be changed via a corresponding, in particular mechanical change in the geometry of at least one of the two nozzle subspaces.

In particular, the static pressures can also be variably set via a differential or ratio pressure control and / or regulation.

In particular, a corresponding control and / or regulating device may be provided which is designed for a corresponding control or regulation.

According to an expedient embodiment, the means for setting different partial jet speeds may in particular comprise mechanical means for variably setting the geometries of both nozzle subspaces. In this case, the means for the variable adjustment of the geometries of both nozzle subspaces can be embodied in particular such that the geometries of the two nozzle subspaces can be set separately from one another.

According to an advantageous alternative embodiment, the means for setting different partial jet velocities are designed so that for variable adjustment of the difference or the ratio of acting on the two opposite sides of the blade static pressures only the geometry of one of the two nozzle subspaces is variably adjustable.

The means for variably setting the geometry of a respective nozzle subspace advantageously comprise at least means for variably adjusting the nozzle subspace length. In this case, the means for the variable adjustment of the nozzle subspace length may in particular comprise means for variably setting the length of the nozzle wall bounding the respective nozzle chamber on the side opposite the blade.

According to a further expedient practical embodiment, the means for variably setting the geometry of a respective nozzle subspace comprise at least means for variably adjusting the board of an aperture provided in the gap region.

In certain cases, it may be advantageous if the means for variably adjusting the geometry of a respective nozzle subspace both means for variable adjustment of the nozzle subspace length, preferably means for variably adjusting the length of the opposite side of the lamella on the respective nozzle chamber bounding nozzle wall, as well Comprising means for variable adjustment of the board of a provided in the gap area panel.

The lamella is preferably at least partially made of plastic, in particular CFRP.

Advantageously, the lamella may also partially made of plastic, in particular CFK, and partially made of metal.

According to a preferred practical embodiment of the device according to the invention, means are provided for controlling and / or regulating the z-orientation in the fibrous web via the means for variably setting different partial-jet speeds.

Preferably, means are provided for online monitoring, control and / or regulation of the z-orientation in the fibrous web.

The supply of a, for example, two nozzle subspaces comprehensive system is thus carried out over a single constant part such as a common inlet pipe or transverse distribution pipe. It can be provided a flexible or movably mounted and rigid executed lamella. Due to the interaction of the two hydraulic subsystems, the exit speed of the two partial beams or the ratio of the exit speeds is changed by changing the geometry of at least one of the two nozzle subspaces.

This can be done for example by a particular variable setting different nozzle lengths and / or a particular variable setting different aperture boards, whereby the static pressure on the movable or the flexible blade is changed or integrally on the bottom and top is different.

As a result, the blade deviates from its position, and the clear gap on both sides changes. This also changes the two stock suspension volumes in the two nozzle compartments. On the side of the reduced nozzle gap or the smaller amount of pressure loss is reduced in the turbulence generator section concerned, and the pressure at the nozzle top increases to a new pressure equilibrium in both nozzle subspaces. This results in that the exit velocity of the sub-beam is increased on the side of the smaller nozzle gap. On the side of the larger nozzle gap, the opposite happens.

It is advantageous if the lamella is very stiff and the bend remains relatively low in itself. The blade preferably consists of plastic, in particular CFRP. However, it is also a combination of metal and plastic, in particular CFRP conceivable.

The device can thus in particular a hinged blade extending at least to the nozzle end, a mechanical device that changes the nozzle space on at least one side over the entire width of the headbox (for example, iris board, front wall displacement) and a turbulence insert with a common inlet of all tubes include. Optionally, a differential pressure control is possible in particular.

Fig. 1

eine schematische Darstellung einer beispielhaften Ausführungs- form einer Vorrichtung zur Herstellung und/oder Behandlung einer Faserstoffbahn mit einem Mehrschichtenstoffauflauf, bei dem die Länge eines Düsenteilraumes variabel einstellbar ist;

Fig. 2

eine schematische Darstellung einer weiteren beispielhaften Ausführungsform der Vorrichtung mit einem Mehrschichtenstoff- auflauf, bei dem jeweils der Vorstand einer im Spaltbereich eines jeweiligen Düsenraumes vorgesehenen Blende variabel einstellbar ist;

Fig. 3

eine schematische Darstellung einer dritten beispielhaften Ausfüh- rungsform einer Vorrichtung zur Herstellung und/oder Behandlung einer Faserstoffbahn mit einem Mehrschichtenstoffauflauf, bei dem jeweils der Vorstand einer im Spaltbereich eines jeweiligen Düsen- raumes vorgesehenen Blende variabel einstellbar ist;

Fig. 4

eine schematische Darstellung einer vierten beispielhaften Ausfüh- rungsform einer Vorrichtung zur Herstellung und/oder Behandlung einer Faserstoffbahn mit einem Mehrschichtenstoffauflauf, bei dem jeweils der Vorstand einer im Spaltbereich eines jeweiligen Düsen- raumes vorgesehenen Blende variabel einstellbar ist.

The invention will be explained in more detail below with reference to exemplary embodiments with reference to the drawing; in this show:

Fig. 1

a schematic representation of an exemplary embodiment of an apparatus for producing and / or treating a fibrous web with a multi-layer headbox, in which the length of a nozzle part space is variably adjustable;

Fig. 2

a schematic representation of another exemplary embodiment of the device with a multi-layer material casserole, in each of which the board of a provided in the gap region of a respective nozzle chamber aperture is variably adjustable;

Fig. 3

a schematic representation of a third exemplary embodiment of an apparatus for producing and / or treating a fibrous web with a multi-layer headbox, in each of which the board of a provided in the gap region of a respective nozzle chamber aperture is variably adjustable;

Fig. 4

a schematic representation of a fourth exemplary embodiment of an apparatus for producing and / or treating a fibrous web with a multi-layer headbox, in which each of the board of a provided in the gap region of a respective nozzle space aperture is variably adjustable.

Fig. 1 shows a schematic representation of an exemplary embodiment of an apparatus 10 for producing and / or treating a fibrous web, which may be in particular a paper or board web.

The apparatus 10 comprises a multi-material headbox 12 fed with pulp suspension for producing a pulp suspension jet 18 composed of a plurality of partial beams 14, 16.

The multi-layer headbox 12 comprises a turbulence generator 20 and a nozzle 22 arranged downstream in the flow direction L of the pulp suspension and having a nozzle space 24 which is divided into a plurality of nozzle subspaces 24 ', 24 "by at least one lamella 26. In the present exemplary embodiment, the multi-layer headbox 12 is designed as a two-layer headbox whose nozzle chamber 24 is divided by a hinged blade 26 into two nozzle subspaces 24 ', 24 ", which adjoin the articulated blade 26. The articulated blade 26 in this case has an average stiffness S of at least 10 Nm, preferably 60 Nm, wherein the stiffness S of the articulated blade 26 may extend in the machine direction and / or in the cross-machine direction. Further, it may also have a constant thickness in the machine direction.

Separate pulp suspension partial flows are guided through the two nozzle subspaces 24 ', 24 ", at each end of the nozzle subspaces 24', 24" remote from the respective associated turbulence generator section 20 'or 20 "a respective machine-wide gap 28 or 29 is provided, through which a respective one Partial beam 14 and 16 is generated.

The multi-layer headbox 12 is articulated to the feed of the two via the relevant turbulence generator sections 20 ', 20 " mounted lamella 26 adjacent nozzle subspaces 24 ', 24 "one associated with this common constant part or pulp feed 30. As with reference to Fig. 1 can be seen, is provided in the present case as a common constant part or pulp feed 30, a common transverse distribution pipe. Thus, both turbulence generator sections 20 ', 20 "are fed with pulp suspension via one and the same constant part 30 or transverse distribution tube.

In the present embodiment, the articulated blade 26 is articulated in the region of its end facing the turbulence generator 20. In this case, the articulated lamella 26 may in particular be pivotably mounted about an axis 46 extending in the machine transverse direction.

In addition, means 32 are provided for variably setting different speeds of the two partial beams 14, 16 via a corresponding, in particular machine-wide, change in the geometry of at least one of the two nozzle subspaces 24 ', 24 "In the present exemplary embodiment, only the geometry of the upper nozzle subspace 24' changed.

The articulated blade 26 extends at least into the gap region of the two adjacent nozzle subspaces 24 ', 24 "and preferably at least to the gap-side ends of the nozzle walls 34, 36, the adjacent nozzle subspaces 24', 24" on the respective articulated Limit lamella 26 opposite side.

The means 32 for setting different partial jet velocities comprise means 38 for variably setting the geometry of at least one of the two nozzle subspaces 24 ', 24 ", here for example only the nozzle subspace 24', via which the geometry of a respective nozzle subspace, in this case of the nozzle subspace 24 ', thus it can be changed that the static pressure acting on the relevant side on the articulated lamella 26 is variable, and by means of this means 38 for variable adjustment of the geometry, at least one of the corresponding mechanical change of the geometry Both nozzle subspaces 24 ', 24 ", here only the nozzle subspace 24', the difference or the ratio of acting on the two opposite sides of the articulated blade 26 static pressures changed. By means of which the static pressures can be variably adjusted by means of a differential or ratio pressure control and / or regulation, the relevant control and / or regulating device can thus be configured such that a differential or ratio pressure control or regulation takes place.

The means 38 for the variable adjustment of the geometry of a respective nozzle subspace, here for example the one nozzle subspace 24 ', in the present case comprise means for the variable adjustment of the nozzle subspace length. In this embodiment, these means for the variable adjustment of the nozzle subspace length in the present embodiment comprise means for variably setting the length I of the side opposite the articulated lamella 26 to the nozzle subspace 24 'bounding nozzle wall 34. Here, the length I is the effective length of the respective nozzle wall 34 ie the length of the wall section extending from the respective turbulence generator section, here the turbulizer section 20 ', to the gap-side end.

As based on the Fig. 1 can be seen, the respective nozzle wall, here the nozzle wall 34, displaceable in the longitudinal direction, whereby the length, for example, the nozzle part space 24 ', for example, by the amount 40 is variable.

In the present case, the z-profile in the pulp suspension jet 18 can thus be influenced via an adjustment of the length of the nozzle subspace 24 '. While in a symmetrical nozzle for the partial beams 14, 16 equal exit velocities would be present, for example, with a caused by a corresponding displacement of the nozzle wall 34 shortening the length of the nozzle part space 24 'results in a higher exit velocity for the upper part of the beam 14th

This results in two turbulence generator section 20 ', the nozzle subspace 24' and the gap 28 and the turbulence generator section 20 ", the nozzle subspace 24" and the nozzle 29 comprehensive systems that are hydraulically coupled via the common constant member 30 and the articulated blade 26th be mechanically coupled.

The pressure p ₃₀ in the common constant part 30 is applied to both turbulence generator sections 20 ', 20 ". The turbulence generator insert _20' results in a pressure drop dp _{20 '} , while the pressure drop occurring at the turbulence generator section _20" is denoted by dp _{20 "} .

At the articulated blade 26, a moment equilibrium sets.

wobei

• p_stat,24' = statischer Druck in dem Düsenteilraum 24';
• p_stat,24" = statischer Druck in dem Düsenteilraum 24".

Due to the mechanical coupling of the two systems by the hinged blade 26, the following relationship applies: $$\mathrm{\int }\left(\mathrm{x}\mathrm{\cdot }{\mathrm{p}}_{\mathrm{stat}\mathrm{.}\mathrm{24}\mathrm{\text{'}}}\right)\mathrm{=}\mathrm{\int }\left(\mathrm{x}\mathrm{\cdot }{\mathrm{p}}_{\mathrm{stat}\mathrm{.}\mathrm{24}\mathrm{"}}\right)\mathrm{;}$$

in which

• p _{stat, 24 '} = static pressure in the nozzle compartment 24';
• p _{stat, 24 "} = static pressure in the nozzle compartment 24".

• Die gelenkig gelagerte Lamelle 26 hält die Position.
• Die Summe der Momente (Druckkräfte x Abstand) oben und unten ist gleich.
• Es muss eine Querkraft auf das Gelenk wirken.

If the moment of the articulated lamella 26 on the joint zero, then:

• The hinged blade 26 holds the position.
• The sum of the moments (compressive forces x distance) above and below is the same.
• There must be a lateral force on the joint.

$${\mathrm{p}}_{\mathrm{30}}\mathrm{=}{\mathrm{dp}}_{20ʺ}\mathrm{+}{\mathrm{p}}_{\mathrm{dyn}\mathrm{,}\mathrm{16}}{\mathrm{bei\; p}}_{\mathrm{u}}\mathrm{;}$$

wobei

• pdyn,14 = dynamischer Druck des Teilstrahls 14;
• pdyn,16 = dynamischer Druck des Teilstrahls 16;
• pu = Umgebungsdruck.

Due to the hydraulic coupling of the two systems in the common constant part 30, the following relationships apply: $${\mathrm{<figure-callout\; id="30"\; label="p"\; filenames="imgf0001.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{30}}\mathrm{=}{\mathrm{<figure-callout\; id="20"\; label="dp"\; filenames="imgf0001.png"\; state="\{\{state\}\}">dp</figure-callout>}}_{\mathrm{20}\mathrm{\text{'}}}\mathrm{+}{\mathrm{p}}_{\mathrm{dyn}\mathrm{.}\mathrm{14}}{\mathrm{at\; p}}_{\mathrm{u}}\mathrm{;}$$

$${\mathrm{<figure-callout\; id="30"\; label="p"\; filenames="imgf0001.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{30}}\mathrm{=}{\mathrm{<figure-callout\; id="20"\; label="dp"\; filenames="imgf0001.png"\; state="\{\{state\}\}">dp</figure-callout>}}_{20"}\mathrm{+}{\mathrm{p}}_{\mathrm{dyn}\mathrm{.}\mathrm{16}}{\mathrm{at\; p}}_{\mathrm{u}}\mathrm{;}$$

in which

• pdyn, 14 = dynamic pressure of the sub-beam 14;
• pdyn, 16 = dynamic pressure of the sub-beam 16;
• pu = ambient pressure.

At a given pressure in the common constant part 30, the jet velocity thus depends directly on the pressure drop dp _{20 '} or dp _{20 "} .

At the same pressure in the common constant part 30, the jet velocity therefore sets as a function of the length of the nozzle subspace 24 'or 24 ".

According to this embodiment Fig. 1 Thus, with a displacement of the nozzle wall 34 on one side of the nozzle 22 results in a change in the nozzle length and the integral pressure on the articulated blade 26 on the relevant page.

If, by contrast, the variable setting of the geometry of a respective nozzle subspace 24 ', 24 "is variably adjustable, for example, the board of an aperture provided in the respective gap region, then the jet velocity adjusts correspondingly at the same pressure in the common constant part 30 as a function of the lip opening.

Fig. 2 shows a schematic representation of such an exemplary embodiment of the device 10, wherein in each case the board of a provided in the gap region of a respective nozzle part space 24 ', 24 "aperture is variably adjustable.The hinged blade 26 in this case again has an average stiffness S of at least 10 Nm , preferably 60 Nm, wherein the stiffness S of the articulated lamella 26 may extend in the machine direction and / or in the cross-machine direction, and may also have a constant thickness in the machine direction.

In the present case, the means 38 for variable adjustment of the geometry of a respective nozzle subspace 24 ', 24 "thus comprise means for variably adjusting the board of an aperture 42 or 44 provided in the gap area.

In the present embodiment, both the board of the upper nozzle part space 24 'associated aperture 42 and the board of the lower nozzle part space 24 "associated aperture 44 are each variably adjustable, with preferably a separate adjustability of these panels 42, 44' is given instead of a displaceable outer nozzle wall so here are the boards of the two panels 42, 44 adjustable.

Incidentally, this embodiment has at least substantially the same structure as that of the Fig. 1 , wherein like reference numerals are assigned to corresponding parts.

As already mentioned, the jet velocity as a function of the lip opening now arises at the same pressure p ₃₀ in the common constant part 30. The asymmetric geometry of the nozzle 22 can thus be brought about here by the fact that the boards of the panels 42 and 44 are chosen differently.

In the present case, therefore, there is a change in the integral pressure curve over a nozzle profile change effected via the diaphragm baffles, whereby the integral static pressure on the side with a larger baffle board is increased. In the present case, therefore, results for example for the partial beam 16 on the side of the smaller diaphragm board a higher partial beam velocity.

FIG. 3 and FIG. 4 show in principle two alternative embodiments of the in the Fig. 2 illustrated apparatus 10 for the production and / or treatment of a fibrous web. Thus, with regard to the basic description of the description in the Fig. 2 shown device 10 for the production and / or treatment of a fibrous web referenced.

Unlike the one in the Fig. 2 shown device 10 for the production and / or treatment of a fibrous web has in each of the FIGS. 3 and 4 Device 10 shown a rigidly mounted blade 26, so a blade 26 without joint on, the stiffness S in turn is on average again at least 10 Nm.

The rigidly mounted slat 26 of the Fig. 3 consists of a homogeneous material and it has a constant thickness. Its rigidity S is at least in the region of the nozzle 22 10 to 1,000 Nm, wherein the stiffness S of the rigidly mounted blade 26 may extend in the machine direction and / or in the cross-machine direction.

By contrast, the rigidly mounted lamella 26 of Fig. 4 made of a non-homogeneous material and it has a non-constant thickness (sections AD). The illustrated properties of the sections AD, such as the material properties mentioned and the height and their gradients, are merely exemplary. The rigidity S of this rigidly mounted lamella 26 is at least in the region of the nozzle 22 10 to 500 Nm, wherein the stiffness S of the rigidly mounted blade 26 may extend in the machine direction and / or in the cross-machine direction.

LIST OF REFERENCE NUMBERS

10

contraption

12

Multi-layer headbox

14

partial beam

16

partial beam

18

Fibrous suspension beam

20

turbulence generator

20 '

Turbulence generator section

20 "

Turbulence generator section

22

jet

24

nozzle chamber

24 '

Nozzles subspace

24 "

Nozzles subspace

26

lamella

28

gap

29

gap

30

Constant part, pulp feed, inlet pipe

32

Means for variably setting different partial jet velocities

34

nozzle wall

36

nozzle wall

38

Means for variable adjustment of the geometry

40

amount

42

cover

44

cover

46

axis

A

section

B

section

C

section

D

section

L

flow direction

I

length

S

rigidity

Claims (18)

Apparatus (10) for producing and / or treating a fibrous web, in particular paper or board web, with a multi-material headbox (12) fed with fibrous suspension for producing a fibrous suspension jet (18) composed of a plurality of partial beams (14, 16), which has a turbulence generator (20 ) and a downstream in the flow direction (L) of the pulp suspension nozzle (22) with a nozzle chamber (24) which is divided by at least one blade (26) into a plurality of nozzle subspaces (24 ', 24 "), wherein a respective blade (26) adjoin two nozzle subspaces (24 ', 24 ") through which separate pulp suspension sub-streams are guided and at the ends remote from the respective associated turbulence generator section (20', 20"), a respective machine-wide gap (28, 29) is provided through which a respective partial beam (14, 16) is generated,
characterized,
in that the multi-layer headbox (12) is supplied with a common constant part or fiber feed (30) for feeding the two nozzle subspaces (24 ', 24 ") adjoining a respective plate (26) via the respective turbulence generator sections (20', 20") .
in that the lamella (26) has a stiffness (S) which is on average at least 10 Nm, the stiffness (S) being defined as $$\mathrm{S}\mathrm{=}{\mathrm{Eh}}^{\mathrm{3}}\mathrm{/}\mathrm{12}\left(\mathrm{1}\mathrm{-}{\mathrm{v}}^{\mathrm{2}}\right)\mathrm{.}$$

where S is the stiffness of the sipe (26), E is the modulus of elasticity of the sipe (26), h is the thickness of the sipe (26), and v is the transverse strain number for the material of the sipe (26), and
in that means (32) are provided for variably setting different speeds of the two relevant partial beams (14, 16) via a corresponding, in particular machine-wide, change of the geometry of at least one of the two nozzle subspaces (24 ', 24 "). Device according to claim 1,
characterized,
in that the multi-layer headbox (12) for feeding the two nozzle subspaces (24 ', 24 ") adjacent to a respective blade (26) to the respective turbulence generator sections (20', 20") has a common inlet pipe (30), in particular a common transverse distribution pipe, assigned. Apparatus according to claim 1 or 2,
characterized,
that the lamella (26) is mounted facing in particular in the region of the turbulence generator (20) end in an articulated or rigid. Device according to one of the preceding claims,
characterized,
in that the lamella (26) extends at least into the gap region of the two adjacent nozzle subspaces (24 ', 24 ") and preferably at least up to the gap-side ends of the nozzle walls (34, 36) which surround the adjacent nozzle subspaces (24', 24"). ) on the respective side of the lamella (26). Device according to one of the preceding claims,
characterized,
in that the means (32) for setting different partial jet speeds comprise means (38) for variably setting the geometry of at least one of the two nozzle subspaces (24 ', 24 "), via which the geometry of a respective nozzle subspace (24', 24") is variable in that the static pressure acting on the lamella on the relevant side can be changed. Device according to claim 5,
characterized,
in that the means (38) for variably setting the geometry are embodied such that the difference or the ratio of the values on the two opposite sides of the one part of the two nozzle subspaces (24 ', 24 ") is determined by a corresponding, in particular mechanical change of the geometry Slat (26) acting static pressures is changeable. Device according to claim 6,
characterized,
that the static pressures can be variably adjusted via a differential or relative pressure control and / or regulation. Device according to one of the preceding claims,
characterized,
in that the means (32) for setting different partial jet speeds comprise in particular mechanical means (38) for variably setting the geometries of both nozzle subspaces (24 ', 24 "). Device according to claim 8,
characterized,
in that the means (32) for variably setting the geometries of both nozzle subspaces (24 ', 24 ") are designed such that the geometries of the two nozzle subspaces (24', 24") can be set separately from one another. Device according to one of claims 1 to 7,
characterized,
in that the means (38) for variably setting the geometry are designed such that only the geometry of one of the two nozzle subspaces (24 ', 24'), for variably setting the difference or the ratio of the static pressures acting on the two opposite sides of the vane (26). 24 ") is variably adjustable. Device according to one of the preceding claims,
characterized,
in that the means (38) for variably setting the geometry of a respective nozzle subspace (24 ', 24 ") comprises at least means for the variable adjustment of the nozzle subspace length. Device according to claim 11,
characterized,
in that the means for variable adjustment of the nozzle subspace length comprise means for variably setting the length (I) of the nozzle wall (34, 36) bounding the respective nozzle subspace (24 ', 24 ") on the side opposite the blade (26). Device according to one of the preceding claims,
characterized,
in that the means (38) for variably setting the geometry of a respective nozzle subspace (24 ', 24 ") comprise at least means for the variable adjustment of the board of an aperture (42, 44) provided in the gap area. Device according to one of the preceding claims,
characterized,
in that the means (38) for variably adjusting the geometry of a respective nozzle subspace (24 ', 24 ") both comprise means for variable adjustment of the nozzle subspace length, preferably means for variably setting the length (I) of the side opposite the blade (26) the nozzle part space (24 ', 24 ") limiting the nozzle wall (34, 36), as well as means for variable adjustment of the board of a provided in the gap region aperture (42, 44). Device according to one of the preceding claims,
characterized,
that the lamella (26) at least partially made of plastic, in particular CFRP, there is. Device according to one of the preceding claims,
characterized,
that the lamella (26) is partially made of plastic, in particular CFRP, and partly consists of metal. Device according to one of the preceding claims,
characterized,
in that means are provided for controlling and / or regulating the z-orientation in the fibrous web via the means (32) for variably setting different partial jet speeds. Device according to one of the preceding claims,
characterized,
in that means for online monitoring, control and / or regulation of the z-orientation in the fibrous web are provided.

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